84 lines
2.6 KiB
C
84 lines
2.6 KiB
C
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/******************************************************************************
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AudioScience HPI driver
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Copyright (C) 1997-2012 AudioScience Inc. <support@audioscience.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of version 2 of the GNU General Public License as
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published by the Free Software Foundation;
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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HPI Operating System function implementation for Linux
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(C) Copyright AudioScience Inc. 1997-2003
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******************************************************************************/
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#define SOURCEFILE_NAME "hpios.c"
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#include "hpi_internal.h"
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#include "hpidebug.h"
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#include <linux/delay.h>
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#include <linux/sched.h>
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void hpios_delay_micro_seconds(u32 num_micro_sec)
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{
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if ((usecs_to_jiffies(num_micro_sec) > 1) && !in_interrupt()) {
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/* MUST NOT SCHEDULE IN INTERRUPT CONTEXT! */
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schedule_timeout_uninterruptible(usecs_to_jiffies
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(num_micro_sec));
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} else if (num_micro_sec <= 2000)
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udelay(num_micro_sec);
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else
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mdelay(num_micro_sec / 1000);
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}
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/** Allocate an area of locked memory for bus master DMA operations.
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If allocation fails, return 1, and *pMemArea.size = 0
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*/
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u16 hpios_locked_mem_alloc(struct consistent_dma_area *p_mem_area, u32 size,
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struct pci_dev *pdev)
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{
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/*?? any benefit in using managed dmam_alloc_coherent? */
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p_mem_area->vaddr =
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dma_alloc_coherent(&pdev->dev, size, &p_mem_area->dma_handle,
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GFP_DMA32 | GFP_KERNEL);
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if (p_mem_area->vaddr) {
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HPI_DEBUG_LOG(DEBUG, "allocated %d bytes, dma 0x%x vma %p\n",
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size, (unsigned int)p_mem_area->dma_handle,
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p_mem_area->vaddr);
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p_mem_area->pdev = &pdev->dev;
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p_mem_area->size = size;
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return 0;
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} else {
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HPI_DEBUG_LOG(WARNING,
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"failed to allocate %d bytes locked memory\n", size);
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p_mem_area->size = 0;
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return 1;
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}
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}
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u16 hpios_locked_mem_free(struct consistent_dma_area *p_mem_area)
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{
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if (p_mem_area->size) {
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dma_free_coherent(p_mem_area->pdev, p_mem_area->size,
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p_mem_area->vaddr, p_mem_area->dma_handle);
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HPI_DEBUG_LOG(DEBUG, "freed %lu bytes, dma 0x%x vma %p\n",
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(unsigned long)p_mem_area->size,
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(unsigned int)p_mem_area->dma_handle,
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p_mem_area->vaddr);
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p_mem_area->size = 0;
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return 0;
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} else {
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return 1;
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}
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}
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